内蒙古二连裂谷盆地“同盆多类型”铀矿床组合与找矿方向  

Multiple type uranium deposit assemblage and uranium exploration in Erlian rift Basin, Inner Mongolia

作　　者：聂逢君[1] 李满根[1] 邓居智[1] 严兆彬[1] 张成勇[1] 姜美珠[1] 杨建新[2] 旷文战[2] 康世虎[2] 申科峰[2] 

机构地区：[1]东华理工大学核资源与环境国家重点实验室培育基地,江西南昌330013 [2]核工业二0八大队,内蒙古包头014010

出　　处：《矿床地质》2015年第4期711-729,共19页Mineral Deposits

基　　金：国家重点基础研究发展规划973计划项目“中国北方砂岩型铀矿流体成矿过程研究(编号:2015CB453002)”;国家自然科学基金项目(编号:40972067)联合资助

摘　　要：自20世纪90年代开始,核工业部门在二连盆地中开展了广泛的铀矿找矿工作,在乌兰察布和马尼特2个坳陷中发现了多个不同类型的铀矿床。文章从裂谷盆地的发展演化入手,分析了二连盆地构造演化阶段和各阶段中沉积充填类型特征。根据构造-沉积-含铀含氧流体在时空上的耦合作用及其结果,初步建立了早白垩世早期腾格尔组中含煤(砂)泥岩型道尔苏矿床、侧向氧化和垂向氧化形成的赛汉组中古河道砂岩型巴彦乌拉和赛汉高毕矿床、以及晚白垩世二连组中由蒸发沉积-成岩-热流体改造形成的努和廷矿床等"同盆多类型"铀矿成矿模型。同时,依据铀矿床成矿地质作用和地质特征,以及不同类型铀矿化发育的空间部位特点,指出了"同盆多类型"铀矿在盆地凹陷中发育的有利空间位置,总结了裂谷盆地不同阶段的"同盆多类型"铀矿床组合规律,为在东北亚地区类似盆地中找寻相似的铀矿床组合指明了方向。A number of uranium deposits have been discovered in Wulanchabu and Manite subbasins of Erilan Basin oy nuclear industry department since the 1990＇s. In this paper, the authors analyzed the tectonic and sedimentary evolution of the Erlian rift basin. Based upon the temporal and spatial coupling of tectonics, sedimentation, and U-O-bearing fluids, the authors tentatively established the uranium mineralization models of the Cretaceous and Tertiary period for the Erlian basin. They are coal-bearing （sandstone） mudstone type Daoersu deposit in the Tenggeer Formation, paleo-channel type Bayanwula deposit and Saihangaobi deposit in the Saihan Formation,and evaporation sedimentation-diagenesis-hydrothermal reworking type Nuheting deposit in the Erlian Formation. These different types of uranium deposits occurring in a single basin like Erlian are defined as a multiple type uranium deposit assemblage for a rift basin. According to the characteristics of each type of deposits, the stratigraphic intervals favorable for uranium enrichment are predicted in the depressions of the Erlian basin. This multiple type assemblage is significant for uranium exploration in the rift basins like the Erlian basin in the Northeast Asia.

关 键 词：地质学 “同盆多类型”铀矿床组合 含铀含氧流体 裂谷 找矿方向 二连盆地 

分 类 号：P619.14[天文地球—矿床学]